Security article including diffractive optic filter

Details Security article including diffractive optic filter Security article including diffractive optic filter

B - Operations, Transporting

44

F

B44F 1/12 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01) G02B 5/18 (2006.01) G02B 5/20 (2006.01) G02B 27/42 (2006.01)

Patent

CA 2376463

A security article such as banknotes, credit cards, passports, security passes, etc. comprising a transparent plastics substrate (2) bearing a diffractive optic filter (6) comprising at least a first zone (7) and second zone (8), with first and second diffractive structures or gratings formed in each zone. The first diffractive structure being operative to discriminatingly project a first selected colour at a first selected colour at a viewing angle by diffracting at least a first spectral component (e.g. red and green) of polychromatic light transmitted through said first zone by at least an angle .theta. from said viewing angle, said first colour forming at least part of a projected security image when said diffractive optic filter is viewed at said viewing angle.

L'invention concerne un article de sécurité tel qu'un billet de banque, une carte de crédit, un passeport, un laissez-passer de sécurité, etc. comportant un substrat de plastique transparent (12) pourvu d'un filtre optique de diffraction (16) comprenant au moins une première zone (7) et une seconde zone (8) comprenant une première et une seconde structure ou réseau de diffraction. La première structure de diffraction sert à projeter de manière discriminante une première couleur choisie à un angle de visualisation en faisant subir une diffraction à au moins un premier composant spectral (par exemple, rouge et vert) de lumière polychromatique transmise par une première zone selon au moins un angle .theta. par rapport à l'angle de visualisation, ladite première couleur faisant au moins partie d'une image de sécurité projetée lorsque ledit filtre optique de diffraction est visualisé selon l'angle.

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